The water in which aquifer in the central United States is apparently being depleted more rapidly than it is being replenished, thus threatening the future of farming in certain regions?
A) Ogallala
B) Texarkana
C) Legumino
D) Nebraskan
A
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Stress can have a significant effect on the body. Chronic stress
a. may lead to excessive stimulation of neurons. b. is associated with elevated levels of epinephrine from the adrenal cortex. c. is associated with elevated levels of cortisol from the adrenal cortex. d. may lead to increased blood flow to the brain, especially the hippocampus. e. may suppress stimulation of neurons.
A change in a cell's DNA sequence is
A. translation. B. a mutation. C. replication. D. transcription. E. an operon.
Cyanide is a poison which prevents the last carrier in the electron transport chain (cytochrome C oxidase) from transferring the electron to the final electron acceptor. Which of the following would not be a consequence of exposure to this poison?
A) ADP would no longer be recharged to form ATP. B) Glycolysis, the intermediate reaction, and the Krebs cycle would stop as the cell would run out of the necessary oxidized coenzymes NAD+ and FAD. C) Movement of electrons through the chain would stop. D) Carbon dioxide would continue to be generated. E) Protons would no longer be pumped outside the membrane.
Which of the following is not true of bacterial plasmids?
A. They are required for host growth and/or reproduction. B. They can replicate independently of the chromosome. C. They may carry genes that enhance survival of the bacterium under certain conditions. D. They may carry genes for drug resistance.